91 Ford AC electrical

Asked by Aug 14, 2016 at 09:42 PM about the 1991 Ford F-350 2 Dr STD 4WD Standard Cab LB

Question type: Maintenance & Repair

I have a 91 F350 Custom with the 460. It didn't come from the factory with
AC, and now I'm trying to install AC into the truck. The system came out of
a 93 F150, So it is a factory system. I currently have two hot wires, that
when connected and low pressure bypassed  sends power to the
compressor. So I have two hots at the compressor. Is this right? I don't
have another truck to test the power and Google isn't helping.

2 Answers

98,415

You most likely have two powers but only one goes to the compressor clutch the other feeds in input to the ECM for the A/C on signal, but as you have a 91 truck, one wire will not be used. I have a wiring diagram but for some reason I can't get it to download to the site.

98,415

Try www.fordforums.com

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